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�������պ����ѧѧ�� 2006, Vol. 32 Issue (04) :435-439    DOI:
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SAR imaging formation and geometric correction method based on diving model
Sun Bing, Zhou Yinqing, Chen Jie, Li Chunsheng*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ��Ը��ٸ���״̬��б��SAR(Synthetic Aperture Radar)�߷ֱ��ʳ�����ͼ���У�����������о�,������ͨ�õ�SAR�ռ伸��ģ��,�ڴ˻������Ƶ��˸���״̬�µĵ�Чб�Ӿ���ģ��,��������Ӧ�Ļز��ź���ѧģ��.���ݸ��ٸ���SAR���ź��ص�,����Burst����ģʽ,���øĽ���ECS(Extended Chirp Scaling)�����㷨���г�����,�����˳��������̺���λ�������ӱ��ʽ.���ݾ��뷽�̺Ͷ����ն�λ�������Ƶ������ECS�����㷨�ļ���У�����㹫ʽ.���������������,�Ľ�ECS�㷨�ܹ��Ը���ģʽSAR���и߷ֱ��ʳ�����,����б��SAR���нϺõĴ�������,����ļ���У�������ܹ��ܺõ���������ʧ��.
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Abstract�� The squint SAR(synthetic aperture radar) high resolution imaging formation and geometric correction method based on the diving model were studied. The general three-dimensional geometric model was founded based on the SAR movement mode. The equivalent squint range model was derived from this general geometric model and the echo signal expression was given based on this range model. According to the signal's characteristic, burst work mode was adopted in diving SAR, and a modified ECS(extended chirp scaling) imaging algorithm was utilized to form high resolution image. The imaging formation flow chart and four ECS phase compensation factors were presented. According to the range equation and Doppler positioning equation, geometric correction calculating expressions corresponding to ECS algorithm were derived. The computer simulation results illuminated that the modified ECS algorithm could be used to form high resolution image for diving model SAR and squint SAR, also geometric distortion could be calibrated with this correction method.
Keywords�� synthetic aperture radar   signal processing   radar imaging   diving model   extended chirp scaling algorithm   geometric correction     
Received 2005-04-20;
About author: �� ��(1981-),��,������ˮ��,��ʿ��, sun@ee.buaa.edu.cn.
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���, ������, �½�, ���.���ڸ���ģ�͵�SAR������ͼ���У��[J]  �������պ����ѧѧ��, 2006,V32(04): 435-439
Sun Bing, Zhou Yinqing, Chen Jie, Li Chunsheng.SAR imaging formation and geometric correction method based on diving model[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(04): 435-439
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2006/V32/I04/435
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